Abstract
A two-range, five-dial potentiometer is described which incorporates a decade construction suggested by Wenner. The upper range is 1.9111 volts in steps of 10 microvolts and the lower range is one tenth of this. The effect of contact resistance, thermal emf's and of errors in adjustment is considered in detail. The limit of error for the instrument is 0.005 percent or 2 microvolts for the high range and 0.01 percent or 0.2 microvolt for the low range.
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